2. Draw the base

Go to the Tool Bar and select the Rectangle
Tool or
press the letter U on
your keyboard. Now make sure that the option Paths is
selected in the Options Bar:

Note: You can change the color of the shape by double clicking on the color box in the options bar:

Now activate the Move Tool in
the Tool Bar.
Make sure that Show Bounding Box in the Options
Bar is selected:

In Photoshop CS2 it's called Show Transform Controls.

We don't want to see only one side of the pyramid when
we're done, so we're going to rotate the base shape.
Move your cursor close to one of the corner points until it changes into a double arrow and press and hold your left mouse button and rotate the shape until you have something
like this:

Release the left mouse button and double click on the shape to finalize the rotation.

We're still looking at the base of the pyramid from
a bird's view perspective, as if we're flying above it.
We add perspective by pulling down the point marked with red...

...until we have something like this:

Double click on this shape to finalize the action and
turn 'Show Bounding Box' off ('Show Transform Controls' if you use Photoshop CS2).

By only drawing the base
we're able to draw the rest of the pyramid as soon as
we know
where
to mark
its
top.
For that you need to remember the center point (X)
of any of the virtual diagonals (look at the next image), either the center
of line A-D or line B-C.
Once you have that center (X), then you know
where to place the top (T), which should be somewhere
along the vertical line going through X. Where
exactly along this line? In reality it equals the distance between X and
any of the corner points, but since we're dealing with perspective, things
get a bit more complicated, so without getting involved in math, since that's
not what we are here for, you just imagine the top above X,
at a distance of about 2/3 of the length of for
example line C-D.

Rotating the shape and changing its perspective hasn't moved the original
center of our rectangular shape, so it will still be exactly on the vertical
guide going through the middle of our shape, so keep that in mind when you
mark the top in our next step (just let it snap to the guide that is party
covered by the
red
arrow in my example)).

I hope that all this doesn't sound all too confusing
and if it does, don't you worry; continue to the next
page and
things
will become much clearer.